z/OS system UTC time change notes - such as DST Daylight Saving Time changes

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Article ID: 49278

calendar_today

Updated On:

Products

CA Date Simulator

Issue/Introduction

Description:

When set (or re-set) the system date/time value, that specifies the offset from UTC, you have to follow a specific procedure relating to CA Date Simulator.

Solution:

When you set (or re-set) the z/OS system date/time value, that specifies the offset from UTC, you have to act as follows:

  • First CLEAR all CA Date Simulator "sets"
  • Reset the system time
  • Then do the CA Date Simulator "sets" again

If this isn't done, CA Date Simulator "results" will be off by the new time offset from UTC - for example by one hour when changing back from the Daylight Saving Time to normal/winter time or vice versa.

Environment

Release:
Component: TWARP